Sumthread: a one-rule number puzzle built around a single continuous path

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Sumthread is a number puzzle where players trace one unbroken path through every tile on a grid, moving only horizontally or vertically without revisiting any tile. Along the way, the running sum must hit target values in sequence, with each reached target locking its tile and resetting the count. The final target must land on the board's last tile. The game offers visual reach cues, free backtracking, and a clean-completion seal in place of timers or penalties. It includes daily boards, multiple grid sizes, several visual themes, and accessibility options, and it runs offline on iPhone without accounts or third-party tracking.

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